Wired and sized battery enclosure

How to select your lead-acid batteries

The first and most important step to configure your battery back is to know your system’s voltage. Small systems used in RVs and boats are usually 12V. It is recommended to use 24V or 48V for medium sized energy systems and always 48V for large systems. Some systems can even go up to 60V, however, 12V, 24V and 48V are the standard in solar and renewable energy systems. Whatever your system voltage is, keep that number in mind since it will be consistent across your system design; changing your system voltage down the road could be a costly alternative.

Another factor is to know the space available for the batteries, this is especially true for mobile applications and systems with a designated battery enclosures. These type of enclosures are usually designed for a certain type and number of batteries, for example, four L-16 batteries.

Knowing the type of battery you want is also part of the selection process. You only want to use deep-cycle batteries in renewable energy systems. Lead acid batteries are the most common, they can be flooded or sealed. Flooded batteries require periodic maintenance such as refilling water levels while sealed or VRLA batteries are considered maintenance free. Flooded batteries are seen in most renewable energy systems mainly because of their lower cost. Applications in remote locations with difficult access call for sealed batteries that do not require constant human supervision. Both batteries, flooded and sealed, are comparable in terms of performance; the determining factors are the application and cost.

A factor that requires careful consideration is your energy needs which ultimately will determine the size of your battery bank. Technically speaking, the larger the battery bank, the better. A large battery bank will reduce the depth of discharge of each cycle, thus extending the life of the batteries. Realistically, not everybody has the budget for an oversized battery bank.

Once the above factors have been figured out, the rest is relatively easy. The number of batteries in the bank will be determined by the voltage, if you have a 48V system you will need eight 6V batteries or twelve 4V batteries.

Wired and sized battery enclosure

Wired and sized battery enclosure

Your energy requirements will determine the capacity, or the total amount of energy stored in the battery bank. It is usually measured in charge / discharge cycles. This part can get highly technical so we are going to simplify it for the purpose of this article. The capacity of your storage is measured in Ampere-Hour or Ah per cycle. To extend the life of the batteries it is recommended to discharge your batteries less than fifty percent per cycle (50% depth of discharge or DOD). So if you know that you need 350Ah to power all your loads on daily basis, you should consider a 700Ah battery bank for a healthy life cycle. In the same scenario, a 900-1000Ah battery bank won’t hurt, it will provide additional energy on the days when it is needed and will also help extend the life of the batteries by reducing the depth of discharge of each cycle. Needless to say it will also cost more money.

Note: As a rule of thumb, the larger the size of the battery bank, the lower the nominal voltage of each battery. For example, 12V batteries are only recommended in small systems with one or two batteries. 6V batteries are ideal for medium size banks and are widely used in renewable energy systems. 4V and 2V are high capacity batteries reserved for large energy systems.

The following table shows a complete list of all the deep cycle lead-acid batteries available through Webo Solar. The table shows which batteries are flooded and which ones are sealed; it also indicates some basic specs such as voltage, capacity, dimensions and weight. Prices are approximate.

Manufacturer Type Part No. Volts Ah @ 20 hr Ah @ 100 hr Length (in) Width (in) Height (in) Weight (lbs) Price
Surrette Rolls Flooded S-480 6 Volt 375 486 12-1/4 7-1/8 16-3/4 117 $317
Surrette Rolls Flooded S-550 6 Volt 428 554 12-1/4 7-1/8 16-3/4 127 $349
Surrette Rolls Flooded S-620 6 Volt 482 624 12-1/4 7-1/8 16-3/4 131 $407
Surrette Rolls Flooded S-1450 2 Volt 1050 1380 12-1/2 7-1/8 16-3/4 115 $362
Surrette Rolls Flooded S-1660 2 Volt 1200 1590 12-1/2 7-1/8 16-3/4 121 $413
Surrette Rolls Flooded S-1860 2 Volt 1300 1729 12-1/2 7-1/8 16-3/4 125 $471
Surrette Rolls Flooded S-1400EX 2 Volt 1000 1408 12/1/2 7-1/8 16-3/4 114 $443
Surrette Rolls Flooded 2-KS-33PS 2 Volt 1766 2491 13-3/4 8-5/16 24-13/16 208 $874
Surrette Rolls Flooded 2-YS-31PS 2 Volt 2430 3435 15-1/2 9-1/4 31-5/8 285 $1,218
Surrette Rolls Flooded 4-CS-17PS 4 Volt 546 770 14-3/8 8-1/4 18-1/4 128 $627
Surrette Rolls Flooded 4-KS-21PS 4 Volt 1104 1557 15-3/4 9-3/8 24-3/4 267 $1,094
Surrette Rolls Flooded 4-KS-25PS 4 Volt 1350 1900 15-3/4 10-5/8 24-3/4 315 $1,370
Surrette Rolls Flooded 6-CS-17PS 6 Volt 546 770 22-1/4 8-1/4 18-1/4 221 $892
Surrette Rolls Flooded 6-CS-21PS 6 Volt 683 963 22-1/4 8-1/4 18-1/4 271 $1,066
Surrette Rolls Flooded 6-CS-25PS 6 Volt 820 1156 22-1/4 8-1/4 18-1/4 318 $1,229
Surrette Rolls Flooded 8-CS-17PS 8 Volt 546 770 28-1/4 8-1/4 18-1/4 294 $1,181
Surrette Rolls Flooded 8-CS-25PS 8 Volt 820 1156 28-1/4 11-1/4 18-1/4 424 $1,632
Surrette Rolls Flooded 12-CS-11PS 12 Volt 357 503 22-1/4 11-1/4 18-1/4 272 $1,089
Surrette Rolls Sealed S-275AGM 6 Volt 250 275 10-1/4 7-1/8 10-3/4 77 $366
Surrette Rolls Sealed S-460AGM 6 Volt 415 460 11-3/4 7-1/8 16-3/4 272 $600
Surrette Rolls Sealed S2-590 2 Volt 550 590 9-1/2 6-3/4 14-1/2 71 $425
Surrette Rolls Sealed S2-945 2 Volt 880 945 16-1/4 6-7/8 14-1/2 118 $695
Surrette Rolls Sealed S2-1180 2 Volt 1100 1180 18-3/4 6-7/8 14-1/2 142 $851
Surrette Rolls Sealed S2-1275 (L16) 2 Volt 1150 1275 38294 39630 16-3/4 123 $611
Surrette Rolls Sealed S2-1895 2 Volt 1750 1895 15-3/4 13-5/8 14-3/4 229 $1,373
Surrette Rolls Sealed S2-2375 2 Volt 2200 2375 19-1/4 13-3/4 15-1/8 287 $1,729
Surrette Rolls Sealed S2-3560 2 Volt 3300 3560 27-7/8 13-7/8 15-1/8 431 $2,524
Trojan Flooded T-605 6 Volt 210 233 10-3/8 7-1/8 10-7/8 58 $130
Trojan Flooded T-105 6 Volt 225 250 10-3/8 7-1/8 10-7/8 62 $153
Trojan Flooded T-125 6 Volt 240 266 10-3/8 7-1/8 10-7/8 66 $171
Trojan Flooded T-145 6 Volt 260 286 10-3/8 7-1/8 11-5/8 72 $203
Trojan Flooded L16P-AC/LT 6 Volt 420 433 11-5/8 7-1/8 16-3/4 113 $319
Trojan Flooded L16H-AC/LT 6 Volt 435 466 11-5/8 7-1/8 16-3/4 121 $353
Trojan Flooded T-105-RE 6 Volt 225 250 10-3/8 7-1/8 10-7/8 67 $165
Trojan Flooded L16RE-2V 2 Volt 1110 1235 11-5/8 7-1/8 17-11/16 119 $353
Trojan Flooded L16RE-A 6 Volt 325 360 11-5/8 7-1/8 17-11/16 115 $305
Trojan Flooded L16RE-B 6 Volt 370 410 11-5/8 7-1/8 17-11/16 118 $348
Trojan Flooded 24TMX 12 Volt 85 n/a 11-1/4 6-3/4 9-3/4 41 $151
Trojan Flooded 27TMX 12 Volt 105 n/a 12-3/4 6-3/4 9-3/4 53 $165
Trojan Flooded SCS150 12 Volt 100 n/a 11-1/4 6-3/4 9-3/4 50 $165
Trojan Flooded SCS200 12 Volt 115 n/a 12-3/4 6-3/4 9-3/4 60 $189
Trojan Flooded SCS225 12 Volt 130 n/a 13-15/16 6-3/4 9-3/4 66 $201
Trojan Flooded IND9-6V 6 Volt 445 545 15-3/8 10-1/4 24-1/4 220 $780
Trojan Flooded IND13-6V 6 Volt 673 820 22-3/8 10-1/4 24-1/4 315 $993
Trojan Flooded IND17-6V 6 Volt 897 1090 26-11/16 10-1/4 24-1/4 415 $1,125
Trojan Flooded IND23-4V 4 Volt 1233 1500 22-3/8 10-1/4 24-1/4 370 $1,057
Trojan Flooded IND29-4V 4 Volt 1570 1910 26-11/16 10-1/4 24-1/4 465 $1,276
US Battery Flooded US2000 6 Volt 216 n/a 10-1/4 7-1/8 11-1/4 59 $116
US Battery Flooded US2200 6 Volt 232 n/a 10-1/4 7-1/8 11-1/4 63 $128
US Battery Flooded US125 6 Volt 242 n/a 10-1/4 7-1/8 11-1/4 67 $150
US Battery Flooded US145 6 Volt 251 n/a 10-1/4 7-1/8 11-7/8 70 $173
US Battery Flooded USL16 6 Volt 380 n/a 11-7/8 7-1/8 16-3/4 111 $263
US Battery Flooded USL16HCL 6 Volt 415 n/a 11-7/8 7-1/8 16-3/4 117 $293
US Battery Flooded USL16HCL 6 Volt 415 n/a 11-7/8 7-1/8 16-3/4 117 $289
US Battery Flooded USRE-L16XC 6 Volt 428 n/a 11-7/8 7-1/8 16-3/4 124 $373
Full River Sealed DC224-6 6 Volt 224 n/a 10-1/4 7-1/8 9-3/4 66 $261
Full River Sealed DC250-6 6 Volt 250 n/a 10-3/8 7-1/8 10-3/8 77 $304
Full River Sealed DC400-6 6 Volt 400 n/a 11-5/8 7-1/8 16-3/4 123 $486
Full River Sealed DC85-12 12 Volt 85 n/a 10-1/4 6-3/4 8-1/2 55 $222
Full River Sealed DC105-12 12 Volt 105 n/a 12-1/4 6-3/4 8-1/2 67 $259
Full River Sealed DC115-12 12 Volt 115 n/a 12-7/8 6-3/4 8-1/2 72 $274